{
  "name": "verify-loop-failure-says-what-failed",
  "nodes": [
    {"id": "n1", "name": "Trigger", "type": "click-trigger", "position": {"x": 0, "y": 0}, "config": {}},
    {"id": "items", "name": "Items", "type": "code", "position": {"x": 0, "y": 100},
     "config": {"code": "return { items: ['alpha'] };"}},
    {"id": "loop", "name": "Loop", "type": "loop", "position": {"x": 0, "y": 200},
     "config": {"inputField": "data.result.items", "continueOnError": false}},
    {"id": "boom", "name": "The Node That Broke", "type": "code", "position": {"x": 0, "y": 300},
     "config": {"code": "throw new Error('the model refused to load');"}},
    {"id": "report", "name": "Report", "type": "code", "position": {"x": 200, "y": 300},
     "config": {"code": "return { marker: 'should not run' };"}}
  ],
  "connections": [
    {"sourceNodeId": "n1", "sourceOutput": "main", "targetNodeId": "items", "targetInput": "data"},
    {"sourceNodeId": "items", "sourceOutput": "main", "targetNodeId": "loop", "targetInput": "data"},
    {"sourceNodeId": "loop", "sourceOutput": "loop", "targetNodeId": "boom", "targetInput": "data"},
    {"sourceNodeId": "loop", "sourceOutput": "done", "targetNodeId": "report", "targetInput": "data"}
  ],
  "expectStatus": "failed",
  "expectExecutionError": "Loop body node \"The Node That Broke\" failed on item 0: Error: the model refused to load",
  "expectMissing": ["report"]
}